Aerosol candle snuffer using non-flammable gas

ABSTRACT

An aerosol device for extinguishing candle flames comprises an aerosol container with a supply of pressurized non-flammable gas therein, and a valve assembly on the container for controlling discharge of the pressurized non-flammable gas from the container, wherein a plurality of successively larger orifices are in the valve assembly for reducing the pressure of the pressurized gas as it is discharged through the valve assembly to a level sufficient to extinguish a candle flame but insufficient to blow molten wax from a candle. In a preferred embodiment the quantity of gas discharged is metered in each dispensing cycle, and a gas adsorbing material is in the container for adsorbing and storing a reserve supply of the gas and releasing it into the container as gas is depleted from the container.

This application claims the benefit of U.S. provisional patent application Ser. No. 60/937,208, filed Jun. 26, 2007, the disclosure of which is incorporated in full herein by reference.

FIELD OF THE INVENTION

This invention relates generally to devices for extinguishing candles, and more particularly to a candle snuffer that expels a puff of non-flammable gas against the candle flame to extinguish it.

BACKGROUND ART

Millions of candles are burned in homes, restaurants, places of worship and other places for a variety of purposes. These candles are often extinguished by blowing on the flame, but a person blowing out the candle has to take a deep breath and place their face close to the flame to blow it out with a quick puff. Often this act is too strong and forceful, and hot, liquefied molten wax is blown onto a surrounding surface, sometimes with a burning fragment of the wick—a cause of many home fires in the United States.

Some of the foregoing problems are solved by various candle snuffing devices that are known in the prior art for extinguishing the flames of candles without blowing on them. These typically comprise an inverted conical or bell-shaped housing carried on the end of a long handle, wherein the housing is simply placed over the flame to extinguish it.

Other candle snuffing devices that extinguish candle flames without blowing on them are described in U.S. Pat. Nos. 6,267,581 and 6,305,928. The snuffer described in U.S. Pat. No. 6,267,581 also has an inverted conical housing carried at the distal end of a long handle, but the handle has a reservoir for container a quantity of water, and pump means in the handle is operative to discharge a mist of water into the conical housing to prevent the wick from smoking when the flame is extinguished. The snuffer described in U.S. Pat. No. 6,305,928 also has an elongate handle and a reservoir for containing a quantity of water, with a pump for discharging water against a candle flame to prevent the wick from smoking, but instead of the conical housing on the distal end of the handle as in the '581 patent, this system has a pair of blocks pivoted together along one edge and means connected with the blocks to cause them to swing together against opposite sides of a candle flame to extinguish the flame.

All of the foregoing conventional candle snuffing devices are effective at extinguishing a candle flame, but must be placed over and into intimate contact with the end of the candle in order to extinguish the flame. As a result, molten wax from the candles tends to collect on the snuffing devices over a period of time, requiring them to be cleaned. Moreover, many people object to spraying water against a candle flame to extinguish it because of the potential risk of getting water on surrounding furniture and damaging it.

It would be desirable, therefore, to have a candle snuffing device that enables the flames of candles to be extinguished more easily and safely than is accomplished by blowing on them, that does not require the device to be brought into contact with the candle, and that does not spray water.

DISCLOSURE OF THE INVENTION

The present invention is a candle snuffing device that does not require it to be brought into contact with the candle, and which does not require water to be sprayed.

The candle snuffing device of the invention comprises a container of non-flammable gas under pressure, with means for discharging a puff of the gas against a candle flame with sufficient force and volume to extinguish the flame but insufficient to scatter molten wax. More particularly, the candle snuffer of the invention comprises a non-flammable gas in an aerosol dispenser with a valve and directional actuator that helps aim the puff of gas at the candle flame. The user simply has to point the spout of the device at the base of the flame from a distance of about 2 inches and press the spray actuator for only a short puff.

In a preferred embodiment, the aerosol dispenser includes a metering means that limits the discharge of gas to a small volume or short puff each time the actuator is depressed, and a pressure reducing means that reduce the pressure of the discharged gas to a level that will not blow molten wax. The short, low pressure puff is adequate to extinguish the flame but will not blow the molten wax even if the gas is aimed directly at the molten wax. Additionally, the preferred embodiment includes a gas storage means in the container that stores a reserve supply of gas to replenish the gas as it is used.

More specifically, in a preferred embodiment the dispenser includes a valve assembly having a valve body, a valve stem, and a valve actuator. The metering means comprises a dip tube connected to the valve body, with a ball reciprocable in the dip tube between a stop at the lower end of the dip tube and a seat on the valve body at the upper end of the dip tube, the free volume of the dip tube between the stop and the seat determining the volume of gas discharged during a discharge cycle. The pressure reducing means comprises a series of progressively larger orifices in the valve assembly through which the gas flows as it is being discharged, including a body orifice, a stem orifice, and a terminal orifice. The gas storage means comprises a predetermined quantity of a gas adsorbing material, such as zeolite or activated carbon, that adsorbs and stores a quantity of the gas for subsequent release into the container as the pressure in the container drops below a predetermined level.

In an alternate embodiment of the invention the progressively larger orifices for reducing the discharge pressure are incorporated, but the metering means is omitted.

In another embodiment the metering means for achieving a metered discharge is incorporated, but the progressively larger orifices for reducing the discharge pressure are omitted

Any of the forms of the invention may or may not include the gas storage means for storing a reserve supply of gas.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing, as well as other objects and advantages of the invention, will become apparent from the following detailed description when taken in conjunction with the accompanying drawings, wherein like reference characters designate like parts throughout the several views, and wherein:

FIG. 1 is a side view in elevation, with parts shown in section, of a preferred embodiment of candle snuffer in accordance with the invention being used to extinguish the flame of a candle.

FIG. 2 is an enlarged longitudinal sectional view of the valve assembly for controlling the discharge of the gas against a candle flame, with the valve shown in closed position.

FIG. 3 is a longitudinal sectional view of the valve assembly of FIG. 2, shown in its opened position with the valve actuator depressed.

FIG. 4 is a longitudinal sectional view similar to FIG. 3, showing an alternate embodiment that incorporates progressively larger orifices for reducing the discharge pressure but omits the metering means.

FIG. 5 is a longitudinal sectional view similar to FIG. 3, showing another embodiment that incorporates the metering means but omits the progressively larger orifices.

BEST MODES FOR CARRYING OUT THE INVENTION

A preferred embodiment of aerosol device according to the invention is indicated generally at 10 in FIG. 1, shown directing a puff of non-flammable gas 11 against the flame F of a candle C to extinguish the flame. The device comprises a container 12 made of metal, plastic, glass or other suitable material, and in the particular embodiment disclosed herein has a valve cup 13 affixed to the upper end thereof. A valve assembly 14 is affixed to the cup, with a directional valve actuator 15 attached to the valve to operate it. A dip tube 16 is attached to the valve body, and comprises a part of a metering means that discharges only a predetermined quantity of the gas in any discharge cycle. The metering means includes a ball 17 that is free to reciprocate up and down in the dip tube, with a stop such as a pin 18 or other means, such as inwardly formed dimples or the like, at a desired location in the tube to limit downward movement of the ball in the tube. When the valve actuator is depressed, pressurized gas flows up the dip tube, carrying the ball with it. At its upper limit of travel, the ball seats against a seat 19 on the lower end of the valve assembly. The volume of the dip tube between the pin 18 and the seat 19 determines the volume of gas that will be discharged in a single cycle when the valve actuator is depressed and held down.

As seen best in FIGS. 2 and 3, the valve assembly 14 comprises a valve body 20 having a reduced diameter tubular lower end portion 21 with the seat 19 on its lower end, and a larger diameter tubular upper end portion 22 with a castellated upper end 23 crimped into the valve cup 13. A body orifice 24 is formed in the valve body between the upper and lower end portions, and the dip tube 16 is received on the end of the lower end portion 21.

If desired, radially extending webs 25 can be formed in the valve body at the lower end of the upper portion to serve as a seat for a spring as described hereinafter.

A valve stem 30 has a lower end reciprocable in the tubular upper portion of the valve body 20, and a tubular upper end portion 31 extending through the valve cup, with the actuator 15 attached to it. A spring 32 is engaged on the lower end of the valve stem and acts between the valve stem and valve body to urge the valve stem in an upward direction. At least one stem orifice 35 extends through the side of the valve stem at the lower end of the tubular upper end, and a sealing gasket 36 secured between the valve cup 13 and the upper end of the valve body 20 in surrounding relationship to the valve stem normally closes the stem orifice when the actuator 15 is not depressed, as shown in FIG. 2.

A terminal orifice 40 is formed in the actuator 15, and a discharge spout 41 leads to the exterior of the actuator. If desired, an elongate discharge spout 41′ may be affixed to the actuator, as indicated in dot-and-dash lines.

In accordance with the invention, the body orifice 24, valve stem orifice 35, and terminal orifice 40 are progressively larger toward the outlet so that as the gas leaves the container it undergoes expansion and the pressure is reduced to a level that will not scatter the molten wax as the device is used to blow out a candle flame. In a specific construction the body orifice 24 has a diameter of from 0.010 to 0.013 inch; the stem orifice 35 has a diameter of 0.013 to 0.018 inch; the terminal orifice 40 has a diameter of 0.10 inch; and the discharge spout 41 has a diameter of 0.24 inch. Using a diameter of 0.010 inch for the body orifice and 0.013 inch for the stem orifice, the area of the stem orifice thus is 1.7 times the area of the body orifice; the area of the terminal orifice is 59 times the area of the stem orifice; and the area of the discharge spout is about 5.8 times the area of the terminal orifice. Stated differently, the area of the stem orifice is 1.7 times the area of the body orifice; the area of the terminal orifice is 100 times the area of the body orifice; and the area of the discharge spout is 572 times the area of the body orifice. It should be understood that the invention is not limited to these specific orifice sizes, and other sizes could be used so long as the approximate relative size relationships given are maintained.

FIG. 3 shows the valve actuator 15 and valve stem 30 depressed, and the arrows indicate the flow path of gas from the container and through the sequentially larger orifices. A “puff” of discharged gas sufficient to extinguish a candle flame typically is from about ¼ to about 1 second in duration.

The non-flammable gas can comprise carbon dioxide or nitrogen or other suitable gas for extinguishing the flame. With reference again to FIG. 1, a gas adsorbing and storage material 50 may be placed in the container to adsorb and store a reserve supply of the non-flammable gas. The material may comprise zeolite or activated carbon or other suitable material, and may be incorporated in a pouch, all as disclosed in applicant's prior issued U.S. Pat. No. 7,185,786, the disclosure of which is incorporated in full herein by reference.

An alternate embodiment of the invention is indicated generally at 10A in FIG. 4, wherein like parts are indicated by like reference characters. This form of the invention incorporates the progressively larger orifices 24, 35 and 40 as in the FIG. 3 embodiment, but the metering ball 17 is omitted from valve stem 16′. Thus, the pressure of the discharged gas is reduced as in the first embodiment but flow will continue as long as the actuator is depressed and a supply of gas remains in the container. To use this form of the invention the actuator should be depressed only for an instant to discharge a short puff of gas. The gas storage means 50 may be incorporated in this form of the invention, or omitted.

Another embodiment is indicated generally at 10B in FIG. 5, wherein like parts are indicated by like reference characters. This form of the invention incorporates the metering means, i.e. the ball 17 in dip tube 16, but does not have the pressure-reducing progressively larger orifices in the valve body 20′, valve stem 30′ and valve actuator 15′. Instead, the body orifice 24′, stem orifice 45, and terminal orifice 40′ may be conventionally sized, although in a preferred construction the stem orifice 45 is relatively large, with a diameter on the order of about 0.040 inch. The gas storage means 50 may be incorporated in this form of the invention, or omitted.

While particular embodiments of the invention have been illustrated and described in detail herein, it should be understood that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention as defined by the appended claims. 

1. An aerosol device for extinguishing candle flames, comprising: a container with a supply of pressurized non-flammable gas therein; and an aerosol valve assembly on the container for controlling discharge of the non-flammable gas from the container, said valve assembly having a directional valve actuator for actuating the valve and directing flow of discharged gas against a candle flame, and means to reduce at least one of the quantity and the pressure of the gas discharged to a level sufficient to extinguish a candle flame but insufficient to blow molten wax from the candle.
 2. An aerosol device as claimed in claim 1, wherein: said means to reduce at least one of the quantity and the pressure of the gas reduces both the quantity and the pressure.
 3. An aerosol device as claimed in claim 1, wherein: said means to reduce at least one of the quantity and the pressure of the gas comprises pressure reducing means comprising a plurality of progressively larger orifices through which the gas flows as it is being discharged, to reduce the pressure of the discharged gas.
 4. An aerosol device as claimed in claim 1, wherein: said means to reduce at least one of the quantity and the pressure of the gas comprises metering means to limit the quantity of gas discharged during a dispensing cycle.
 5. An aerosol device as claimed in claim 1, wherein: gas adsorbing and storage means is in said container for adsorbing and storing a reserve supply of said gas and releasing it into the container as the supply of gas is depleted.
 6. An aerosol device as claimed in claim 2, wherein: gas adsorbing and storage means is in said container for adsorbing and storing a reserve supply of said gas and releasing it into the container as the supply of gas is depleted.
 7. An aerosol device as claimed in claim 3, wherein: gas adsorbing and storage means is in said container for adsorbing and storing a reserve supply of said gas and releasing it into the container as the supply of gas is depleted.
 8. An aerosol device as claimed in claim 4, wherein: gas adsorbing and storage means is in said container for adsorbing and storing a reserve supply of said gas and releasing it into the container as the supply of gas is depleted.
 9. An aerosol device as claimed in claim 6, wherein said valve assembly comprises: a valve body having a tubular upper end and a tubular lower end, a valve stem reciprocable in the tubular upper end, and a valve actuator attached to said valve stem to move it downwardly during a dispensing cycle; and said pressure reducing means comprises a body orifice in said valve body, a stem orifice in said valve stem, and a terminal orifice in said actuator, said stem orifice having a larger diameter than said body orifice, and said terminal orifice having a larger diameter than said stem orifice.
 10. An aerosol device as claimed in claim 9, wherein: said metering means comprises a dip tube connected to said lower end of said valve body, a ball reciprocable in said dip tube, a stop in a lower end of said dip tube to retain said ball in said dip tube, and said lower end of said valve body defining a seat against which said ball seats at its upper limit of travel in said dip tube, the volume of the dip tube between said stop and said seat determining the volume of gas discharged during a dispensing cycle.
 11. An aerosol device for extinguishing candle flames, comprising: an aerosol container with a supply of pressurized non-flammable gas therein; a valve assembly on the container for controlling discharge of the pressurized non-flammable gas from the container; and a plurality of successively larger orifices in the valve assembly for reducing the pressure of the pressurized gas as it is discharged through the valve assembly, said reduced pressure being sufficient to extinguish a candle flame but insufficient to blow molten wax from a candle.
 12. A method of extinguishing a candle flame, comprising the steps of: providing a supply of pressurized non-flammable gas in a container; discharging a puff of said pressurized gas from the container and against a candle flame to extinguish it; and using a plurality of sequentially larger orifices in the flow path of the discharged gas to reduce the pressure to a level sufficient to extinguish a candle flame but insufficient to blow molten wax from the candle. 